<template>
  <div className="todo-footer">
    <label>
      <input type="checkbox" @change="change" :checked="isAllDone" />
    </label>
    <span>
      <span> {{ "已完成"+compTotal }}</span> / 全部 {{total}}
    </span>
    <button className="btn btn-danger" @click="this.removeAllCompTodo">
      清除已完成任务
    </button>
  </div>
</template>

<script>
export default {
  name: "Footer",
  props: ["todos", "checkAllTodo", "removeAllCompTodo"],
  computed:{
    compTotal(){
      
      return this.todos.filter(item=>item.done).length
      
    },
    total(){
      return this.todos.length;
    },
    isAllDone(){
      return this.todos.length>0&& this.todos.every(item => item.done)
    }
  },
  
  methods: {
    change(e){
      return this.checkAllTodo(e.target.checked);

    }
  },
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>
